package net.lzzy.practices.entities;

import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import lombok.Getter;
import lombok.Setter;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * @author 2022/5/6.
 * Description
 */

@Entity
@Getter
@Setter
public class Course extends BaseEntity{
    private String name;
    private String description;
    private String cover;
    @Temporal(TemporalType.TIMESTAMP)
    private Date createTime;
    @Temporal(TemporalType.TIMESTAMP)
    private Date updateTime;
    private boolean open;

    public Course(){
        createTime = new Date();
        updateTime = createTime;
    }

    @ManyToOne
    private User teacher;
    @ManyToMany
    private List<User> students = new ArrayList<>();
    @OneToMany(mappedBy = "course")
    private List<Chapter>chapters =new ArrayList<>();

    @OneToMany(mappedBy = "course")
    private List<Applicant>applicants=new ArrayList<>();

    @JsonBackReference
    public User getTeacher(){
        return teacher;
    }

    @JsonIgnore
    public List<User> getStudents(){
        return students;
    }

    @JsonManagedReference
    public List<Chapter> getChapters() {
        return chapters;
    }
    @JsonManagedReference
    public List<Applicant> getApplicants() {
        return applicants;
    }
}
